“Thanks to its high-temperature resistance up to 200°C, resistance to strong acids and alkalis, precision machinability, and insulating properties, PPS rod has become a core material for semiconductor wafer transport and etching equipment, ensuring manufacturing precision and cleanliness, and offering greater stability and durability than metal.”
Polyphenylene sulfide (PPS) rods are a type of high-performance engineering plastic that plays a crucial role in the semiconductor industry due to their excellent heat resistance, chemical stability, mechanical strength, and electrical insulation properties. As semiconductor manufacturing processes become increasingly sophisticated, the demands on materials for heat resistance, corrosion resistance, mechanical wear resistance, and electrical insulation continue to rise; PPS rods are widely adopted because of their unique advantages.
I. Stability in High-Temperature Environments
The semiconductor manufacturing process involves a variety of high-temperature processes, such as silicon wafer cleaning, etching, chemical vapor deposition (CVD), and photolithography. The temperatures for these processes typically range from 150°C to 250°C, and some heat treatment steps can even exceed 300°C. PPS rods have a long-term service temperature of up to 200°C and can withstand short-term temperatures of up to 280°C. Their high heat deflection temperature and low coefficient of thermal expansion enable them to maintain dimensional stability and mechanical properties even under high-temperature conditions.
This characteristic makes PPS suitable for use as supports, positioning blocks, trays, slide rails, and mechanical guide components. In high-temperature environments, it ensures the precise positioning of wafers or components, preventing misalignment and damage caused by thermal expansion.
II. Excellent Chemical Resistance
The semiconductor manufacturing process involves the use of large quantities of strong acids, strong alkalis, and organic solvents, such as hydrofluoric acid, sulfuric acid, phosphoric acid, potassium hydroxide, and various photolithography solvents. PPS rods exhibit exceptional resistance to most acidic and alkaline solutions as well as organic solvents, and are not prone to degradation at either room temperature or high temperatures. This means that PPS components can come into direct contact with chemical media without compromising their service life, making them an indispensable structural material in environments exposed to chemicals.
Common applications include:
1.Components for chemical liquid transfer systems: pump shafts, valve spools, fluid guide components
2.Components in contact with chemical processes: tanks, supports, and clamping fixtures
III. Advantages in Machining and Dimensional Accuracy
Semiconductor equipment components require high precision and tight tolerances. PPS rods offer excellent machinability, allowing for precision turning, milling, and drilling, with high dimensional stability after machining. Compared to metallic materials, PPS’s self-lubricating properties and low wear characteristics help extend the service life of equipment components and reduce maintenance frequency.
For example, in wafer transfer systems, the use of PPS for roller bearings, guide sleeves, and positioning pins reduces friction and wear, ensuring smooth and contamination-free wafer transfer.
IV. Electrical Insulation Advantages
Semiconductor equipment, such as lithography systems, ion implanters, and plasma etching systems, extensively utilizes high-frequency, high-voltage electronic components. PPS rods feature high volume resistivity (approximately 10¹⁵ Ω·cm) and dielectric strength (approximately 20–30 kV/mm), maintaining their insulating properties even in high-temperature and high-humidity environments. This makes them suitable for use as:
- High-voltage insulating supports
- Mounting brackets for electronic sensors
- Protective sleeves for wire channels
In these applications, PPS not only provides mechanical support but also ensures electrical safety by preventing short circuits or dielectric breakdown.
V. Cleanliness and Low-Contamination Properties
Semiconductor manufacturing requires extremely high levels of cleanliness; materials must not release particulates, volatile organic compounds, or ionic contaminants. PPS rods offer:
- Low moisture absorption, reducing contamination caused by moisture
- Chemical resistance, preventing the leaching of impurities
- Abrasion resistance, minimizing particle generation
These properties make PPS ideal for wafer trays, conveyor tracks, and process fixtures, ensuring stable equipment operation and high product yield in cleanroom environments.
VI. Applications of Reinforced and Modified PPS in the Semiconductor Industry
To further enhance mechanical properties and thermal stability, PPS rods are often reinforced with glass fibers or filled with minerals:
- Glass-fiber-reinforced PPS (GF-PPS): Improves rigidity, dimensional stability, and creep resistance
- Mineral-filled PPS: Enhances wear resistance and thermal conductivity, improving heat dissipation performance in wafer handling components
Through these modifications, PPS rods can meet the strength and precision requirements of complex components in semiconductor equipment while maintaining chemical resistance and insulating properties.
VII. Typical Application Examples
1.Wafer Transfer Systems: PPS trays, guide blocks, and brackets offer high-temperature resistance, chemical resistance, and low friction, ensuring the safe movement of wafers.
2.Wet Chemical Cleaning Equipment: PPS pump shafts, valve cores, and flow channel assemblies can come into direct contact with acidic and alkaline solutions without degradation.
3.Lithography and Etching Equipment: PPS brackets and clamping fixtures ensure high-precision positioning and electrical insulation.
4.Semiconductor Cleanroom Components: PPS slide rails, guide components, and micro bearings minimize particle generation and ensure cleanliness.
VIII. Conclusion
The “remarkable” applications of PPS rods in the semiconductor industry stem from their high-temperature stability, chemical resistance, machinability, electrical insulation, and low-contamination properties. Through glass fiber reinforcement or mineral filling modifications, PPS components can achieve high reliability and long service life in wafer handling, wet chemical processing, lithography equipment, and cleanroom applications.
Compared to traditional metals or standard engineering plastics, PPS not only reduces the risk of corrosion and contamination but also significantly improves equipment operational stability. These characteristics make PPS rods an indispensable high-performance material in semiconductor manufacturing processes.
